The term "billable" refers to work that can be charged or billed to a client. In professional services such as law, accounting, consulting and engineering firms, billable means the amount of time spent on tasks that are chargeable to clients. This includes activities like meetings with clients, working on projects, preparing documents, attending conferences, traveling for business purposes or any other work-related activity that can be quantified in terms of hours and charged accordingly. The more billable hours an employee generates, the higher their revenue contribution to the firm.